WO2017156826A1 - Circuit d'entraînement de pixel à diode électroluminescente organique à matrice active (amoled) et procédé d'entraînement de pixels - Google Patents

Circuit d'entraînement de pixel à diode électroluminescente organique à matrice active (amoled) et procédé d'entraînement de pixels Download PDF

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WO2017156826A1
WO2017156826A1 PCT/CN2016/080103 CN2016080103W WO2017156826A1 WO 2017156826 A1 WO2017156826 A1 WO 2017156826A1 CN 2016080103 W CN2016080103 W CN 2016080103W WO 2017156826 A1 WO2017156826 A1 WO 2017156826A1
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thin film
film transistor
scan signal
electrically connected
pixel driving
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PCT/CN2016/080103
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English (en)
Chinese (zh)
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韩佰祥
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深圳市华星光电技术有限公司
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Priority to US15/105,569 priority Critical patent/US10037732B2/en
Publication of WO2017156826A1 publication Critical patent/WO2017156826A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266—Details of drivers for scan electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1213—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1216—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being capacitors

Definitions

  • the present invention relates to the field of display technologies, and in particular, to an AMOLED pixel driving circuit and a pixel driving method.
  • OLED Organic Light Emitting Display
  • OLED Organic Light Emitting Display
  • the OLED display device can be divided into two types: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED), namely direct addressing and thin film transistor (Thin Film Transistor, according to the driving method). TFT) matrix addressing two types.
  • the AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a high-definition large-sized display device.
  • the AMOLED is a current driving device. When a current flows through the organic light emitting diode, the organic light emitting diode emits light, and the luminance of the light is determined by the current flowing through the organic light emitting diode itself. Most existing integrated circuits (ICs) only transmit voltage signals, so the pixel driving circuit of AMOLED needs to complete the task of converting a voltage signal into a current signal.
  • the conventional AMOLED pixel driving circuit is usually 2T1C, that is, a structure in which two thin film transistors are added with a capacitor to convert a voltage into a current.
  • a conventional 2T1C pixel driving circuit for an AMOLED includes: a first thin film transistor T10, a second thin film transistor T20, and a capacitor C10, the first thin film transistor T10 is a switching thin film transistor, and the second The thin film transistor T20 is a driving thin film transistor, and the capacitor C10 is a storage capacitor.
  • the gate of the first thin film transistor T10 is connected to the scan signal Scan(n) corresponding to the row of the pixel driving circuit, the source is connected to the data signal Data, the drain and the gate of the second thin film transistor T20, and the capacitor One end of the C10 is electrically connected; the source of the second thin film transistor T20 is electrically connected to the positive voltage VDD of the power supply, the drain is electrically connected to the anode of the organic light emitting diode D10; and the cathode of the organic light emitting diode D10 is electrically connected.
  • the power supply has a negative voltage VSS; one end of the capacitor C10 is electrically connected to the drain of the first thin film transistor T10, and the other end is electrically connected to the source of the second thin film transistor T20.
  • VSS negative voltage
  • the scan signal Scan(n) controls the first thin film transistor T10 to be turned on, and the data signal Data passes through the first thin film transistor T10 to enter the first The gate of the thin film transistor T20 and the capacitor C10, and then the first thin film transistor T10 is turned off.
  • the gate voltage of the second thin film transistor T20 can continue to maintain the data signal voltage, so that the second thin film transistor T20 is at In the on state, the driving current enters the organic light emitting diode D10 through the second thin film transistor T20, and drives the organic light emitting diode D10 to emit light.
  • the pixel driving circuit shown in FIG. 1 has a simple structure and does not have a compensation function, so there are many defects, and it is obvious that when the organic light emitting diode D10 works for a long period of time, device degradation occurs, the luminous efficiency is lowered, and the luminance of the light is attenuated.
  • the panel of the OLED display device is entirely dark, which affects the display quality of the OLED display device.
  • An object of the present invention is to provide an AMOLED pixel driving circuit capable of compensating for a decrease in luminous efficiency and a decrease in luminance of an organic light emitting diode after long-term operation, thereby improving the display quality of the OLED display device.
  • Another object of the present invention is to provide an AMOLED pixel driving method capable of compensating for a decrease in luminous efficiency and a decrease in luminance of an OLED after long-term operation of an organic light emitting diode, thereby improving display quality of the OLED display device.
  • the present invention first provides an AMOLED pixel driving circuit, comprising: a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a capacitor, and an organic light emitting diode;
  • the gate of the second thin film transistor is connected to the nth scan signal corresponding to the row of the pixel driving circuit, the source is connected to the data signal, and the drain is electrically connected to the first node;
  • the gate of the fourth thin film transistor is connected to the n-1th scan signal corresponding to the previous row of the row of the pixel driving circuit, the source is connected to the reference voltage, and the drain is electrically connected to the first node;
  • One end of the capacitor is electrically connected to the first node, and the other end is electrically connected to the gate of the first thin film transistor;
  • the gate of the third thin film transistor is connected to the n-1th scan signal, the source is electrically connected to the gate of the first thin film transistor, and the drain is electrically connected to the anode of the organic light emitting diode;
  • the gate of the first thin film transistor is electrically connected to the other end of the capacitor, the source is connected to the positive voltage of the power source, and the drain is electrically connected to the source of the fifth thin film transistor;
  • the gate of the fifth thin film transistor is connected to the light emission control signal, the source is electrically connected to the drain of the first thin film transistor, and the drain is electrically connected to the anode of the organic light emitting diode;
  • the anode of the organic light emitting diode is electrically connected to the drain of the fifth thin film transistor and the drain of the third thin film transistor, and the cathode is connected to a negative voltage of the power source.
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, and the fourth thin film are both low temperature polysilicon thin film transistors, oxide semiconductor thin film transistors, or amorphous silicon thin film transistors.
  • the reference voltage is a constant voltage.
  • the nth scan signal corresponding to the row of the pixel driving circuit and the n-1th scan signal corresponding to the previous row of the row of the pixel driving circuit are combined with the light emitting control signal, which sequentially correspond to an OLED turn-on voltage extraction Phase, a data writing phase, and a lighting phase.
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, and the fifth thin film transistor are both P-type thin film transistors
  • the n-1th scan signal is low, the nth scan signal is high, and the illumination control signal is high;
  • the n-1th scan signal is at a high potential
  • the nth scan signal is at a low potential
  • the illuminating control signal is at a high potential
  • the n-1th scan signal is at a high potential
  • the nth scan signal is at a high potential
  • the illumination control signal is at a low potential
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, and the fifth thin film transistor are all N-type thin film transistors
  • the n-1th scan signal is at a high potential
  • the nth scan signal is at a low potential
  • the illuminating control signal is at a low potential
  • the n-1th scan signal is low, the nth scan signal is high, and the illumination control signal is low;
  • the n-1th scan signal is low, the nth scan signal is low, and the illumination control signal is high.
  • the invention also provides an AMOLED pixel driving method, comprising the following steps:
  • Step 1 Providing an AMOLED pixel driving circuit
  • the AMOLED pixel driving circuit includes: a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a capacitor, and an organic light emitting diode;
  • the gate of the second thin film transistor is connected to the nth scan signal corresponding to the row of the pixel driving circuit, the source is connected to the data signal, and the drain is electrically connected to the first node;
  • the gate of the fourth thin film transistor is connected to the n-1th scan signal corresponding to the previous row of the row of the pixel driving circuit, the source is connected to the reference voltage, and the drain is electrically connected to the first node;
  • One end of the capacitor is electrically connected to the first node, and the other end is electrically connected to the gate of the first thin film transistor;
  • the gate of the third thin film transistor is connected to the n-1th scan signal, and the source is electrically connected to the first thin a gate of the film transistor, the drain is electrically connected to the anode of the organic light emitting diode;
  • the gate of the first thin film transistor is electrically connected to the other end of the capacitor, the source is connected to the positive voltage of the power source, and the drain is electrically connected to the source of the fifth thin film transistor;
  • the gate of the fifth thin film transistor is connected to the light emission control signal, the source is electrically connected to the drain of the first thin film transistor, and the drain is electrically connected to the anode of the organic light emitting diode;
  • the anode of the organic light emitting diode is electrically connected to the drain of the fifth thin film transistor and the drain of the third thin film transistor, and the cathode is connected to a negative voltage of the power source.
  • Step 2 entering the OLED turn-on voltage extraction phase
  • the n-1th scan signal provides an effective potential, so that the fourth thin film transistor and the third thin film transistor are both turned on, and the nth scan signal and the light emission control signal both provide a non-effective potential, so that the second thin film transistor and the fifth thin film transistor
  • the thin film transistor is turned off; the first node writes the reference voltage, and the potential Vg of the gate of the first thin film transistor leaks to:
  • Vg VSS+V OLED
  • VSS represents the negative voltage of the power supply
  • V OLED represents the turn-on voltage of the organic light emitting diode
  • Step 3 entering the data writing phase
  • the nth scan signal provides an effective potential to turn on the second thin film transistor, and the n-1th scan signal and the illumination control signal both provide a non-effective potential to make the third thin film transistor, the fourth thin film transistor, and the fifth thin film
  • the transistors are all turned off; the first node writes the voltage V Data of the data signal, and the potential Vg of the gate of the first thin film transistor is capacitively coupled to:
  • Vg V Data -Vref+VSS+V OLED
  • Step 4 entering the lighting stage
  • the n-1th scan signal and the nth scan signal both provide a non-effective potential, so that the second thin film transistor, the third thin film transistor, and the fourth thin film transistor are both turned off, and the light emission control signal provides an effective potential, so that the fifth The thin film transistor is turned on, the first thin film transistor is also turned on, the organic light emitting diode emits light, and the current I OLED flowing through the organic light emitting diode satisfies:
  • VDD represents a positive voltage of the power supply
  • V th1 represents a threshold voltage of the first thin film transistor
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, and the fifth thin film transistor are both P-type thin film transistors; the effective potential is a low potential, and the non-effective The potential is high.
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, and the fifth thin film transistor are all N-type thin film transistors; the effective potential is a high potential, and the non-effective The potential is low.
  • the reference voltage is a constant voltage.
  • the present invention also provides an AMOLED pixel driving circuit, comprising: a first thin film transistor, a second thin film transistor, a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a capacitor, and an organic light emitting diode;
  • the gate of the second thin film transistor is connected to the nth scan signal corresponding to the row of the pixel driving circuit, the source is connected to the data signal, and the drain is electrically connected to the first node;
  • the gate of the fourth thin film transistor is connected to the n-1th scan signal corresponding to the previous row of the row of the pixel driving circuit, the source is connected to the reference voltage, and the drain is electrically connected to the first node;
  • One end of the capacitor is electrically connected to the first node, and the other end is electrically connected to the gate of the first thin film transistor;
  • the gate of the third thin film transistor is connected to the n-1th scan signal, the source is electrically connected to the gate of the first thin film transistor, and the drain is electrically connected to the anode of the organic light emitting diode;
  • the gate of the first thin film transistor is electrically connected to the other end of the capacitor, the source is connected to the positive voltage of the power source, and the drain is electrically connected to the source of the fifth thin film transistor;
  • the gate of the fifth thin film transistor is connected to the light emission control signal, the source is electrically connected to the drain of the first thin film transistor, and the drain is electrically connected to the anode of the organic light emitting diode;
  • An anode of the organic light emitting diode is electrically connected to a drain of the fifth thin film transistor and a drain of the third thin film transistor, and a cathode is connected to a negative voltage of the power source;
  • the first thin film transistor, the second thin film transistor, the third thin film transistor, the fourth thin film transistor, and the fifth thin film transistor are both low temperature polysilicon thin film transistors, oxide semiconductor thin film transistors, or amorphous silicon thin film transistors;
  • the reference voltage is a constant voltage.
  • the AMOLED pixel driving circuit and the pixel driving method provided by the present invention adopt a 5T1C structure driving circuit, and the nth scanning signal, the n-1th scanning signal, and the illuminating control signal are combined, which sequentially correspond to An OLED is turned on in a voltage extraction phase, a data writing phase, and an illuminating phase, and finally the current I OLED flowing through the organic light emitting diode satisfies: I OLED ⁇ (V Data - Vref + VSS + V OLED - VDD - V th1 ) 2 .
  • the I OLED Since the turn-on voltage V OLED of the organic light emitting diode is deteriorated after long-term work, the I OLED is increased, and the brightness of the organic light emitting diode can be compensated qualitatively, thereby reducing the luminous efficiency and illuminating the organic light emitting diode after long-term operation.
  • the brightness is attenuated to compensate for the display quality of the OLED display device.
  • FIG. 1 is a circuit diagram of a conventional 2T1C pixel driving circuit for AMOLED
  • FIG. 2 is a circuit diagram of a first embodiment of an AMOLED pixel driving circuit of the present invention
  • FIG. 3 is a timing diagram of the AMOLED pixel driving circuit shown in FIG. 2;
  • step 2 is a schematic diagram of step 2 of the first embodiment of the AMOLED pixel driving method of the present invention.
  • FIG. 5 is a schematic diagram of step 3 of the first embodiment of the AMOLED pixel driving method of the present invention.
  • FIG. 6 is a schematic diagram of step 4 of the first embodiment of the AMOLED pixel driving method of the present invention.
  • FIG. 7 is a circuit diagram of a second embodiment of an AMOLED pixel driving circuit of the present invention.
  • FIG. 8 is a timing diagram of the AMOLED pixel driving circuit shown in FIG. 7;
  • FIG. 9 is a schematic diagram of step 2 of the second embodiment of the AMOLED pixel driving method of the present invention.
  • FIG. 10 is a schematic diagram of step 3 of the second embodiment of the AMOLED pixel driving method of the present invention.
  • FIG. 11 is a schematic diagram of step 4 of the second embodiment of the AMOLED pixel driving method of the present invention.
  • the present invention first provides an AMOLED pixel driving circuit, which is a 5T1C structure, including: a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, and a fourth Thin film transistor T4, fifth thin film transistor T5, capacitor C1, and organic light emitting diode D1.
  • AMOLED pixel driving circuit which is a 5T1C structure, including: a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, and a fourth Thin film transistor T4, fifth thin film transistor T5, capacitor C1, and organic light emitting diode D1.
  • the gate of the second thin film transistor T2 is connected to the nth scan signal Scan(n) corresponding to the row of the pixel driving circuit, the source is connected to the data signal Data, and the drain is electrically connected to the first node A; the fourth film The gate of the transistor T4 is connected to the n-1th scan signal Scan(n-1) corresponding to the previous row of the row of the pixel driving circuit, the source is connected to the reference voltage Vref, and the drain is electrically connected to the first node A.
  • One end of the capacitor C1 is electrically connected to the first node A, the other end is electrically connected to the gate G of the first thin film transistor T1; the gate of the third thin film transistor T3 is connected to the n-1th scan signal Scan(n- 1)
  • the source is electrically connected to the gate G of the first thin film transistor T1, and the drain is electrically connected to the anode of the organic light emitting diode D1; the gate G of the first thin film transistor T1 is electrically connected to the The other end of the capacitor C1, the source S is connected to the power supply positive voltage VDD, the drain D is electrically connected to the source of the fifth thin film transistor T5; the gate of the fifth thin film transistor T5 is connected to the light emission control signal Em(n),
  • the source is electrically connected to the drain D of the first thin film transistor T1, and the drain is electrically connected to the anode of the organic light emitting diode D1; the anode of the organic light emitting diode D1 is electrically connected to the drain
  • the nth scan signal Scan(n) corresponding to the row of the pixel driving circuit is used to control the on and off of the second thin film transistor T2, and the n-1 corresponding to the upper row of the row of the pixel driving circuit
  • the strip scan signal Scan(n-1) is used to control the on and off of the fourth thin film transistor T4 and the third thin film transistor T3, and the light emission control signal Em(n) is used to control the conduction of the fifth thin film transistor T5.
  • the first thin film transistor T1 is a driving thin film transistor.
  • the reference voltage Vref is a constant voltage.
  • the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, the fourth thin film transistor T4, and the fifth thin film transistor T5 are both low temperature polysilicon thin film transistors, oxide semiconductor thin film transistors, or non- Crystalline silicon thin film transistor.
  • the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, the fourth thin film transistor T4, and the fifth thin film transistor T5 are both P-type thin film transistors.
  • the n-1th scan signal Scan(n-1) is low
  • the nth scan signal Scan(n) is high
  • the illumination control signal Em(n) is high Potential.
  • the fourth thin film transistor T4 and the third thin film transistor T3 are both turned on
  • the second thin film transistor T2 and the fifth thin film transistor T5 are both turned off
  • the first node A writes the reference voltage Vref
  • the potential of the gate G of the first thin film transistor T1 Vg leaks through the turned-on third thin film transistor T3 to:
  • Vg VSS+V OLED (1)
  • VSS represents the negative voltage of the power supply
  • V OLED represents the turn-on voltage of the organic light-emitting diode D1.
  • the n-1th scan signal Scan(n-1) is at a high potential
  • the nth scan signal Scan(n) is at a low potential
  • the illuminating control signal Em(n) is at a high potential.
  • the second thin film transistor T2 is turned on, and the third thin film transistor T3, the fourth thin film transistor T4, and the fifth thin film transistor T5 are both turned off, and the first node A writes the voltage V Data of the data signal Data , the gate of the first thin film transistor T1.
  • the potential Vg of G is coupled by capacitor C1 to:
  • the n-1th scan signal Scan(n-1) is at a high potential
  • the nth scan signal Scan(n) is at a high potential
  • the light emission control signal Em(n) is at a low potential.
  • the second thin film transistor T2, the third thin film transistor T3, and the fourth thin film transistor T4 are both turned off, and the fifth thin film transistor T5 is turned on.
  • the first thin film transistor T1 is also turned on by the storage of the capacitor C1, and the organic light emitting diode D1 emits light. According to the known formula for calculating the current I OLED flowing through the organic light emitting diode:
  • I OLED 1/2Cox( ⁇ W/L)(Vgs-V th1 ) 2 (3)
  • the ⁇ is the carrier mobility of the driving thin film transistor, that is, the first thin film transistor T1
  • W and L are the width and length of the channel of the driving thin film transistor, that is, the first thin film transistor T1, respectively, and Vgs is the driving thin film transistor, that is, the first thin film.
  • the voltage between the gate G and the source S of the transistor T1, V th1 is the threshold voltage of the driving thin film transistor, that is, the first thin film transistor T1.
  • Vs represents the potential of the source S of the first thin film transistor T1.
  • the AMOLED pixel driving circuit of the present invention can increase the I OLED with the increase of the V OLED , and can be qualitatively compensated.
  • the brightness of the OLED D1 is attenuated, so that the illuminating efficiency is lowered and the illuminating brightness is attenuated after long-term operation of the OLED, and the display quality of the OLED display device is improved.
  • the second embodiment is different from the first embodiment in that the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, the fourth thin film transistor T4, and the fifth thin film transistor T5 are both N-type.
  • the thin film transistor correspondingly, sets the potential of the nth scan signal Scan(n), the n-1th scan signal Scan(n-1), and the light emission control signal Em(n) in the second embodiment.
  • the same working process can be realized in the opposite direction to the first embodiment, and the same compensation effect is achieved, and details are not described herein again.
  • the present invention further provides an AMOLED pixel driving method, comprising the following steps:
  • Step 1 provides an AMOLED pixel driving circuit using the 5T1C structure as shown in FIG. 2 or FIG. 7, and the circuit will not be repeatedly described herein.
  • Step 2 Enter the OLED turn-on voltage extraction stage.
  • the n-1th scan signal Scan(n-1) provides an effective potential, so that the fourth thin film transistor T4 and the third thin film transistor T3 are both Turning on, the nth scan signal Scan(n) and the light emission control signal Em(n) both provide a non-effective potential, so that the second thin film transistor T2 and the fifth thin film transistor T5 are both turned off; the first node A writes the reference voltage Vref The potential Vg of the gate G of the first thin film transistor T1 is leaked through the turned-on third thin film transistor T3 to:
  • Vg VSS+V OLED (1)
  • VSS represents the negative voltage of the power supply
  • V OLED represents the turn-on voltage of the organic light-emitting diode D1.
  • the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3, the fourth thin film transistor T4, and the fifth thin film transistor T5 are both P-type thin film transistors.
  • the effective potential is a low potential, and the non-effective potential is a high potential;
  • the second embodiment of the present invention the first thin film transistor T1, the second thin film transistor T2, the third thin film transistor T3,
  • the four thin film transistors T4 and the fifth thin film transistor T5 are both N-type thin film transistors, the effective potential is a high potential, and the non-effective potential is a low potential.
  • Step 3 entering the data writing phase
  • the nth scan signal Scan(n) provides an effective potential to turn on the second thin film transistor T2, and the n-1th scan signal Scan (n-1) and the light emission control signal Em(n) both provide a non-effective potential, so that the third thin film transistor T3, the fourth thin film transistor T4, and the fifth thin film transistor T5 are both turned off; the first node A writes the data signal Data
  • the voltage V Data the potential Vg of the gate G of the first thin film transistor T1 is coupled by the capacitor C1 to:
  • Vg V Data -Vref+VSS+V OLED (2)
  • the effective potential is a low potential, and the non-effective potential is a high potential; and for the second embodiment of the present invention, the effective potential is a high potential, and the non-effective The potential is low.
  • Step 4 entering the lighting stage
  • the n-1th scan signal Scan(n-1) and the nth scan signal Scan(n) both provide a non-effective potential, so that The second thin film transistor T2, the third thin film transistor T3, and the fourth thin film transistor T4 are both turned off, and the light emission control signal Em(n) provides an effective potential, so that the fifth thin film transistor T5 is turned on, and the first thin film transistor T1 is due to the capacitance C1.
  • the storage function is also turned on, the organic light emitting diode D1 emits light, and the current I OLED flowing through the organic light emitting diode D1 satisfies:
  • VDD represents a positive power supply voltage
  • V th1 represents a threshold voltage of the first thin film transistor T1.
  • the effective potential is a low potential, and the non-effective potential is a high potential; and for the second embodiment of the present invention, the effective potential is a high potential, and the non-effective The potential is low.
  • the AMOLED pixel driving method of the present invention can increase the I OLED with the increase of the V OLED , and can be qualitatively compensated.
  • the brightness of the OLED D1 is attenuated, so that the illuminating efficiency is lowered and the illuminating brightness is attenuated after long-term operation of the OLED, and the display quality of the OLED display device is improved.
  • the AMOLED pixel driving circuit and the pixel driving method of the present invention adopt a 5T1C structure driving circuit, and the nth scanning signal, the n-1th scanning signal, and the illuminating control signal are combined to sequentially correspond to an OLED.
  • the current I OLED flowing through the organic light emitting diode finally satisfies: I OLED ⁇ (V Data - Vref + VSS + V OLED - VDD - V th1 ) 2 , Since the turn-on voltage V OLED of the organic light emitting diode is deteriorated after long-term work degradation, the I OLED is increased, and the brightness of the organic light emitting diode can be compensated qualitatively, thereby reducing the luminous efficiency and the attenuation of the light emitting brightness after long-term operation of the organic light emitting diode. The situation is compensated to improve the display quality of the OLED display device.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

La présente invention concerne un circuit d'entraînement de pixels à diode électroluminescente organique à matrice active (AMOLED) et un procédé d'entraînement de pixel. Le pilote de pixels AMOLED utilise une structure 5T1C et comporte: un premier transistor à couches minces (T1), un deuxième transistor à couches minces (T2), un troisième transistor à couches minces (T3), un quatrième transistor à couches minces (T4), un cinquième transistor à couches minces (T5), un condensateur (C1) et une diode électroluminescente organique (D1). Grâce à la combinaison d'un signal de balayage de rang 1 (Balayage (n)), d'un signal de balayage de rang n-1 (Balayage (n -1)), et d'un signal de commande d'émission de lumière (Em (n)), correspondant successivement à une phase d'extraction de tension de commutation de diode électroluminescente organique (OLED), une phase d'écriture de données et une phase d'émission de lumière, un courant (iOLED) circulant dans la diode électroluminescente organique (D1) satisfait ultérieurement à : IOLED∝(VData – Vref + VSS + VOLED – VDD – Vth1)2 <sp />. Etant donné que la tension de commutation VOLED de la diode électroluminescente organique (D1) augmente après une détérioration entraînée par un travail à long terme, le courant IOLED augmente également pour compenser qualitativement l'atténuation de luminosité de la diode électroluminescente organique (D1), permettant l'amélioration de la qualité d'affichage d'un dispositif d'affichage à diodes électroluminescentes organiques.
PCT/CN2016/080103 2016-03-17 2016-04-25 Circuit d'entraînement de pixel à diode électroluminescente organique à matrice active (amoled) et procédé d'entraînement de pixels WO2017156826A1 (fr)

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